I'd say give back but my reason may be a little strange. I make them because I have always wanted to hold in my hand something I had created in 3D. I thought once I create something in cyberspace it stays there. Now not only can I create it in 3D but I can export it into a VERY cheap, easy to manipulate medium... paper/card. Not possible before without the aid of expensive 3D printing machines... (which I just learnes last week my employer has access to with no cost but the machining material).